Protective covering for metals.



JAMES H. SCOTT, OF NEW YORK, N. Y., ASSIGNOR TO HUTCHISON SCOTT COMPANY, A CORPORATION OF NEW YORK;

PROTECTIVE COVERING FOR METALS.

meager.

No Drawing.

To all whom it may concern:

Be it known that 1, JAMES H. Soon, a citizen of the United States, residing in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Protective Coverings for Metals, of which the following is a specification.

The object of my invention is to provlde a protecting covering or coating for metal surfaces, which will be a non-conductor of heat and cold, an electric insulator, will prevent corrosion of the metal, will prevent sweating and condensation, and will not burn when dry or emit fumes or smoke when heated.

The composition comprising my invention, and which has the above properties, includes a base, which may be a paint or any liquid body that will adhere to metal similar to paint, as for instance, varnish, hard oil finish, or the like. The base is best prepared, however, by mixing one or more of such substances as white lead, sublimed, or

zinc white ground in linseed oil, to which is added china-wood oil. This latter substance has the property of assisting in forming a coating that is non-porous. Pine oil may be substituted for the china-wood oil, and is desirableon account of its comparative cheapness, but it has the objectionable feature of being difficult to dry, and its use is therefore limited. Some such substance as these now being considered is, however, necessary to give the best results, as thelinseed oil alone is more or less porous, and will not of itself give the necessary protection to the metal. Instead of the mixture of linseed oil with the lead, zinc or other equivalent, varnish or hard oil finish may be used with the china-wood oil or its substitute. A mixture of zinc, linseed oil and china-wood oil does, however, produce the best base, and gives the best results over the widest field To this onto any of the before mentioned mixtures ma be added an ordinary paint coloring substance to meet the special requirements in any instance. To the base is added one or more substances that are nonconductors of heat and cold, and which assist in making the product an electric insulator. ground cork, powdered. asbestos,'powd ered magnesia, by-product of mineral Wool, lime,

Specification of Letters Patent.

Application filed May 16, 1911.

For this purpose such substances .as'

Patented (Ian. 5, 1915..

Serial No. 627,590.

alum, or saw-dust may be used. Two or more .of these substances may be used together, or they may be added singly to the base. They are intimately mixed therewith so that each particle is coated as far as possible with the liquid base. I have found ground cork to give the best results, and I have used two grades for such purpose, the finer being similar to flour, and the coarser formed of grains about the size of a pin head.

My preparation is intended to be applied with a brush in the manner of paint, but is somewhat thicker than ordinary paint when ready for use. The ingredients as thus far considered will, however, be too thick to be easily applied with a brush, and therefore a thinning liquid is necessary.

Any of those commonly employed inpaints i may be used, as for instance, turpentine, or

tric power to prevent shortcircuiting of the circuit and to prevent electrolitic results.

It will also prevent corrosion of the metal.

It will, moreover, prevent sweating and con-' densation, and is therefore valuable for coating metal freight cars intended for perishable freight, as for instance, cars carrying gram. It is also a non-conductor of heat and cold, and for this reason is admirably adapted for many purposes, such, forinstance, as coating metal seats used in cars, parks, and elsewhere, in order to make them comfortable for use. Its property of not burning when dry or giving off fumes or smoke makes it valuable for use in connection with tunnels, subways and like places where the suffocating efl'ects of smoke and fumes is often more harmful than the fire to the persons therein.

My composition is capable of considerable variations in regard to the proportions used of the respective ingredients, much depending upon the circumstances under which it is used. It is, however, important that the cork or other non-conducting substance be intimately mixed with the base, each particle being completely coated by the base so that when the covering is dry upon the metal surface there will be a continuous coating of the base containing the non-porous china-wood oil (or its substitute) Within which will be the particles of the nonconducting substance, but which will not break up, so to speak, the continuity of the paint base. I have also found it valuable as a securing means when applying cover- 'i-ngs such as sheets of asbestos to metal. It holds the insulating or other covering securely to the metal similar to glue, but at the same time possessing its desirable quali- 4 ties as before mentioned, and will not be affected by Water and atmospheric conditions as glue is.

Having thus described my invention, I claim:

1. A liquid fireproofing and waterproofing covering for metals, composed of a liquid paint base consisting of zinc white ground in linseed oil, china wood oil and a non-conducting pulverulent material.

2. A liquid insulating covering consisting of a mixture of zinc white, linseed oil, china wood oil and ground cork.

3. A liquid insulating covering consisting of a non-conducting pulverulent material, a liquid base coating the particles of said material, said base including zinc White linseed oil and a filler for the linseed oil adapted to form a non-porous coating.

In testimony whereof I have set my hand in the presence oftwo witnesses.

, JAMES H. SCOTT. Witnesses:

SAMUEL O. YEATON,

OLIVE B. KING. 

